Can Aging Be Reversed?

This video by Professor Sinclair is very interesting. He explores the concept of should we spend time working to find ways to slow or reverse the aging process? What type of evidence do we have that it can be done? And to clarify, what people seek is a longer, better quality of life, not to just to extend the life itself, but to remain healthier, longer. BTW - He looks 35! It's believed that he is around 50 years old!